PHILADELPHIA — There might be other teams that could lose a fourth-liner and hardly notice. The Islanders are not one of them.

Grinding winger Cal Clutterbuck left Tuesday night’s 4-3 shootout win over the Flyers at Wells Fargo Center with an unspecified “upper-body injury,” not coming out for the third period. Coach Jack Capuano only said that Clutterbuck “will be reevaluated” on Wednesday, “and then we’ll have a better idea.”

Clutterbuck was seen walking around after the game without a brace or any sort of visible aid.

It did force Capuano to juggle the lines a little in the third, and for a game in which the Islanders struggled mightily to create any momentum, their best moments came with Clutterbuck in the locker room.

“It’s almost nice that you almost don’t know who you’re going with and you just jump over the boards and go play,” said winger Kyle Okposo. “We actually started to play when he shuffled the lines. We stopped thinking a little bit and just went out there and played hockey.”

Captain John Tavares is a two-time Hart Trophy finalist, but has two goals and one assist in his past eight games. With 4:49 remaining in the first period Tuesday, some of his frustration might have manifested itself in an illegal check to the head of Flyers center Sean Couturier, drawing a two-minute minor.

It was unlikely that any further investigation into supplemental discipline would be pursued by the league’s department of player safety.

“When I’ve always dealt with Johnny, when you’re an elite offensive player and you’re going through a situation that he’s going through, I try not to talk to him about it,” Capuano said. “He’s got enough pressure on himself, and I don’t want to add to that pressure.

“If he keeps doing the right things, it’s going to come to him. … He went through this last year, if you remember, then all of sudden, he caught fire. So we’ll see how it goes. I think he’ll be fine.”

Capuano kept the same lineup he had used for the previous five games, meaning Thomas Hickey remained in on defense and Brian Strait was a healthy scratch.

Winger Ryan Strome, 23, stayed in up front while Steve Bernier was a scratch.